Re: RPM Air Gap Intake Porting
[Re: dusterjp]
#1589748
03/08/14 12:48 AM
03/08/14 12:48 AM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
master
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master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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I don't know about air gap since I never used one, but any aftermarket intake I have used seemed to have a bunch of core shift, and the ports were smaller than my gasket matched heads. So I always gasket match them as far in as I could reach to match the gasket/head. I just did a mopar sb 6 pack intake and the ports look so much nicer now! On a duel plane you won't be able to reach all areas like you would on a single plane.
Last edited by ademon; 03/08/14 12:51 AM.
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Re: RPM Air Gap Intake Porting
[Re: dusterjp]
#1589749
03/08/14 12:55 AM
03/08/14 12:55 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Using your gasket see how much the ports are off or how much smaller... the most I would do is port match them to about 1 1/2" up each runner from the head surface... blend them in at that area to the stock runner 
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Re: RPM Air Gap Intake Porting
[Re: dusterjp]
#1589750
03/08/14 05:51 AM
03/08/14 05:51 AM
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Joined: Mar 2008
Posts: 883
Affton MO
qwkmopardan
super stock
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super stock
Joined: Mar 2008
Posts: 883
Affton MO
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I have had several sbm Edelbrock air gaps and all have been fairly close to the size of the gasket, inner wall, floor and roof, so have never seen the need to even gasket match one. The outer wall is not very close but manifold port is as wide or wider than the pushrod pinch in the head. I often wonder if it would do some good to divide the plenum down 3/4" +/- between the upper and lower plenum on the air gap. Never tried it, maybe someone that has will see this and let us know. For a street car with a manual trans. the air gap would be the best choice and I think you can take it out of the box and use it as is, except like most edelbrock sbm manifolds it will probably need .045 to .060 removed from each side to fit properly. They usually fit great without a gasket and when you try installing them with gasket the bolt holes in the manifold will be way above the holes in the heads. If the holes in the manifold and heads don't line up, neither will the roof and floor of the ports. That is on block and heads that have not had a bunch of milling, if heads and block have been cut a bunch, more than .06 may have to be removed. Worst case I have seen is .110".
The victor 340 must be intentionally choked down at the exit so it can be matched to your liking, never seen one even remotely close to the 1213 fel-pro gasket. Also I have used 340 super victors as well and they are the same as the victor, and need a good gasket match and some plenum work. Seems like the victor 340 is a touch better than the super victor, performance wise. And a Victor Jr 340, I have never seen one, it must be special order.
Last edited by qwkmopardan; 03/08/14 05:58 AM.
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Re: RPM Air Gap Intake Porting
[Re: qwkmopardan]
#1589751
03/08/14 04:31 PM
03/08/14 04:31 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Quote:
I have had several sbm Edelbrock air gaps and all have been fairly close to the size of the gasket, inner wall, floor and roof, so have never seen the need to even gasket match one. The outer wall is not very close but manifold port is as wide or wider than the pushrod pinch in the head. I often wonder if it would do some good to divide the plenum down 3/4" +/- between the upper and lower plenum on the air gap. Never tried it, maybe someone that has will see this and let us know. For a street car with a manual trans. the air gap would be the best choice and I think you can take it out of the box and use it as is, except like most edelbrock sbm manifolds it will probably need .045 to .060 removed from each side to fit properly. They usually fit great without a gasket and when you try installing them with gasket the bolt holes in the manifold will be way above the holes in the heads. If the holes in the manifold and heads don't line up, neither will the roof and floor of the ports. That is on block and heads that have not had a bunch of milling, if heads and block have been cut a bunch, more than .06 may have to be removed. Worst case I have seen is .110".
The victor 340 must be intentionally choked down at the exit so it can be matched to your liking, never seen one even remotely close to the 1213 fel-pro gasket. Also I have used 340 super victors as well and they are the same as the victor, and need a good gasket match and some plenum work. Seems like the victor 340 is a touch better than the super victor, performance wise. And a Victor Jr 340, I have never seen one, it must be special order.
I think the Victor 340 and 340 Jr are one in the same.
Fastest 300
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Re: RPM Air Gap Intake Porting
[Re: Streetwize]
#1589753
03/08/14 05:06 PM
03/08/14 05:06 PM
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Joined: Jul 2012
Posts: 429
Washington
skrews
mopar
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mopar
Joined: Jul 2012
Posts: 429
Washington
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Quote:
There never was a Victor Jr for an LA motor, Fords and Chevies maybe, but not mopars.
X 2
Victor or Super Victor
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